noun ダウンロード 🔗共有 リケッチア Any of a group of gram-negative bacteria, of the genus Rickettsia, carried as parasites by ticks, fleas and lice; they cause typhus and other diseases Examples : "The doctor said the child had a fever and symptoms consistent with rickettsia, possibly carried by a tick bite. " 医者は、その子供は発熱しており、マダニに刺された可能性のあるリケッチアと一致する症状があると述べた。 microorganism disease biology medicine organism insect science AIとチャット語彙ゲーム読解練習